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Family Davalliaceae
Rabbit's foot fern
Davallia solida (Forst.) Sw.
HARE'S FOOT FERN

Kuo ye gu sui bu

Scientific names Common names
Davallia solida (Forst.) Sw, Giant hare's foiot (Engl.)
  Rabbit's foot fern (Engl.)
  Hare's foot fern (Engl.)
Davallia solida (G. Forst.) Sw. is an accepted name. No synonyms are recorded for the name. The Plant List
Davallia sinensis (Christ) Ching. is an accepted name, not a synonym of D. solida (Forst.) Sw., but a different species. The Plant List

Other vernacular names
CHAMORRO: Pugua 'machena.
CHINESE: Kuo ye gu sui bu.
PALAU: Luukbedaoch.

Botany
Rabbit's foot fern is an epiphytic, dimorphic fern with finely divided, thickish, and long-creeping rhizomes. Stems are 1 cm or more in diameter. Sterile leaves are pinnate, sub-opposite, broadly deltoid, up to 20 cm long; base tripinnate and narrowly deltoid. Fertile leaves are more deeply lobed, with each lobe bearing several sporangia.

Distribution
- Widespread in the Philippines.
- Also found in the Malay Peninsula to Polynesia.
- Cultivated as a hanging plant or air plant.

Constituents
- Study yielded 4 new compounds: 3' -O-p-hydroxybenzoylmangiferin, 4'-O-p-hydroxybenzoylmangiferin, 6' -O-p-hydroxybenzoylmangiferin, and 3-O-p-hydroxybenzoylmangiferin, as well as eight known
compounds - mangiferin, 2-C-b-D-xylopyranosyl-1,3,6,7-tetrahydroxyxanthone, 4b-carboxymethyl-(À)-epicatechin, 4b-carb-oxymethyl-(À)-epicatechin methyl ester, eriodictyol, eriodictyol-8-C-b-D-glucopyranoside, icariside E5, and icariside E3.
- Rhizomes yielded 9(11),18-diene, ferna-7,18-diene, filica-3,18-diene, filica-3,18,20-triene, fern-9(11)-en-19α-ol, fern-7-en-19α-ol and filic-3-en-19α-ol. (5)
- Isolation and purification from the n-butanol layer of an aqueous extract of rhizome identified 12 compounds, viz. four new compounds: 30-O-p-hydroxybenzoylmangiferin (1), 40-O-phydroxybenzoyl-mangiferin (2), 60-O-p-hydroxybenzoylmangiferin (3), and 3-O-p-hydroxybenzoylmangiferin (4); eight known compounds: mangiferin (5), 2-C-b-D-xylopyranosyl-1,3,6,7-tetrahydroxyxanthone (6), 4b-carboxymethyl-()-epicatechin (7), 4b-carboxymethyl-()-epicatechin methyl ester (8), eriodictyol (9), eriodictyol-8-C-b-D-glucopyranoside (10), icariside E5 (11), and icariside (12). (see study below) (2)
- Study of rhizomes yielded ferna-9(11),18-diene, ferna-7,18-diene, filica-3,18-diene, filica-3,18,20-triene, fern-9(11)-en-19α-ol, fern-7-en-19α-ol and filic-3-en-19α-ol. (2)
- Study yielded a xanthone glycoside, 2-C-ß-D-xylopyransyl-1-3-6-7-tetrahydroxyxanthne together with mangiferin (2-C-ß-D-glucopyranosyl-1,2,5,7-tetrahydroxanthone. (7)

Properties
- Considered antibacterial, antioxidant, tonic, laxative, purgative, anti-inflammatory.

Parts used
Rhizomes, leaves.

Uses

Folkloric
- No known medicinal use in the Philippines.
- Rhizomes used as herb tonic; for treatment of osteoporosis, arthralgia and arthritis.
- In Fiji, used as antibacterial; used for asthma, sore throat.
- In Tahiti, used for dysmenorrhea, uterine hemorrhage, and to promote healthy pregnancy.
- In New Caledonia, used for fish poisoning.
- In Moorea, French Polynesia, used as laxative and purgative; for fractures and sprains. For newborns having difficulty sleeping, leaves are boiled in water, and the baby bathed in the cooled tea until calmed. (1)
- In Tajiti and Fiji, used for the treatment of asthma. In Tahiti, used for dysmenorrhea; also for uterine hemorrhage and leucorrhea. (1)
- In Chinese medicine, used for physique ache, inflammation, cancer and bone injuries.
- In Samoa, leaves used externally as poultice for arthritis.
Others
- Decorative:
Ornate leafs used for floral decorations in fiestas and religious rituals.

Studies
Phenolics / Antioxidant / Rhizomes:
Study of an aqueous extract of rhizomes showed a high content of phenolic compounds with strong DPPH scavenging activity. Solvent partitions of the aqueous extract showed the n-butanol layer to have the highest phenol content (806.3 ± 12.3 mg CE/g dry weight) and DPPH scavenging potential (IC50 = 3.93 ± 0.31 lg dry weight/ml). (see constituents above) (2)
Gusuibu / Antioxidant: Gusuibu is a known folk remedy in traditional Chinese medicine, composed of six different fern ingredients: Drynaria fortunei, Pseudodrynaria coronans, Davallia divaricata Bl., Davallia mariesii, Davallia solida (Forst.) Sw., and Humata griffithiana. In the study, all the extracts of six sources exhibited reducing power in a concentration dependent manner. The ethanol extract of Davallia solida showed the highest radical scavenging activity (26.89 µg extract/ml). Results suggest the total polyphenol compounds in the extracts of the six folk medicinal ferns used as "Gusuibu" contributes significantly to the antioxidant capacities. (3)
Gusuibu / Suppressive Action on Heat-Labile Enterotoxin-Induced Diarrhea: Study evaluated the suppressive action of ethanol extracts of six sources of folk medicinal ferns (Drynaria fortunei, Pseudodrynaria coronans, Davallia divaricata, D. mariesii, D. solida, and Humata griffithiana) used as Gusuibu on heat-labile enterotoxin (LT)-induced diarrhea. Except for DF, the rest, including D. solida might be a candidate for the treatment of LT-induced diarrhea. (6)

Availability
Wild-crafted.

© Godofredo U. Stuart Jr., M.D.

Updated April 2018 / February 2016
May 2011


IMAGE SOURCE: Drawing / Davallia solida / Drawn by A F Lydon, Engraved by Benjamin Fawcett / E J Lowe / Ferns: British and Exotic / Published by George Bell, 1872 / Classic Nature Prints
IMAGE SOURCE: Photo / Davallia solida/ File:Davallia solida a2.jpg / Jerzy Opiolo / GNU Free Documentation License / Wikimedia Commons

Additional Sources and Suggested Readings
(1)
Medical Ethnobotany, Phytochemistry, and Bioactivity of the Ferns of Moorea, French Polynesia
/ Nicole Baltrushes / May 2006 / Moorea Digital Flora Project
(2)
Identification of antioxidants from rhizome of Davallia solida
/ Yung-Husan Chen, Fang-Rong Chang et al / Food Chemistry 107 (2008) 684-691. / DOI 10.1016/j.foodchem.2007.08.066
(3)
Antioxidant activities and polyphenol contents of six folk medicinal ferns used as "Gusuibu"
/ Hung-Chi Chang, Guan-Jhong Huang et al / Botanical Studies (2007) 48: 397-406.
(4)
Samoan Medicinal Plants and Their Usage / ADAP 93-1 • Reprinted May 2001
(5)
Pharmacognostical Studies on "Ku-tui-po" III. : Constituents of the Rhizomes of Davallia solida / Tanaka Yasuko, Kitajima Jumichi, Agetq Hiroyuki / Natural medicines 52(5), 409-413, 1998-10-20
(6)
The Suppressive Activities of Six Sources of Medicinal Ferns Known as Gusuibu on Heat-Labile Enterotoxin-Induced Diarrhea / Hung-Chi Chang, Jaw-Chyun Chen, Jiun-Long Yang, Hsin-Sheng Tsay, Chien-Yun Hsiang and Tin-Yun Ho * / Molecules 2014, 19, 2114-2120; doi:10.3390/molecules19022114
(7)
A new C-glycosyl xanthone isolated from Davallia solida / Sandrine Rancon, Annie Chaboud, Nicole Darbour, Gilles Comte, Denis Barron, Jean Raynaud, Pierre Cabalion / Phytochemistry 52 (1999) 1677-1679

It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page.

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